noun

1. A category into which sexually-reproducing organisms are divided on the basis of their reproductive roles in their species.

   “The effect of the medication is dependent upon age, sex, and other factors.”

2. Another category, especially of humans and especially based on sexuality or gender roles.

3. The members of such a category, taken collectively.

verb

1. To determine the sex of an animal.

2. To have sex with.

Synonyms: gender